stumped on a sump!
Thread Starter
Staging Lane
Joined: Sep 2007
Posts: 75
Likes: 0
stumped on a sump! whats up everybody? im installing a 5.3/4l65e in my 64 malibu im use ing a external fuel pump. stock fuel tank 72 malibu sending unit with return do i need to make a sump? and why? thanks
Joined: Sep 2004
Posts: 3,147
Likes: 12
From: Downers Grove, IL
You don`t HAVE to sump the tank, but it would be a good idea.
With a carb when you corner or accelerate hard and the fuel pickup sucks air it does not matter, but with EFI the pump runs dry which isn`t good, and the engine will immediately fall flat on its face.
If you don`t sump the tank you will probably have to always run with a minimum of 1/4 to 1/2 tank to avoid fuel sloshing away from the pickup
With a carb when you corner or accelerate hard and the fuel pickup sucks air it does not matter, but with EFI the pump runs dry which isn`t good, and the engine will immediately fall flat on its face.
If you don`t sump the tank you will probably have to always run with a minimum of 1/4 to 1/2 tank to avoid fuel sloshing away from the pickup
+1
Having a sump just means your allowing for the fuel to enter the lowest center of gravity (LOG), which will ensure that fuel is always being supplied to the pump.
Jegs sells a sump kit for $60 plus fittings, or you can just buy a fuel cell with the sump already in it if you don't feel like mutilating your factory tank.
Having a sump just means your allowing for the fuel to enter the lowest center of gravity (LOG), which will ensure that fuel is always being supplied to the pump.
Jegs sells a sump kit for $60 plus fittings, or you can just buy a fuel cell with the sump already in it if you don't feel like mutilating your factory tank.
